<!DOCTYPE html [<?xml-stylesheet href="data:text/css,html{z-index: 1}"?>]>
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>xml-stylesheet processing instruction in doctype internal subset</title>
    <link rel="help" href="https://drafts.csswg.org/cssom/#prolog"/>
    <script src="../../resources/testharness.js"></script>
    <script src="../../resources/testharnessreport.js"></script>
  </head>
  <body>
    <script>
      promise_test(async () => {
        await new Promise(resolve => window.onload = resolve);
        assert_equals(getComputedStyle(document.documentElement).zIndex, "auto");
      });
    </script>
  </body>
</html>
